15 months is a long time, i think you could have a problem, might be wise for him to visit you again and wed in the phils or for him to come back and then apply for a fiancee visa..
but
Intervening Devotion If the applicant and sponsor have been separated for a lengthy period of time before the application is submitted (for example, longer than 3 or 4 months), then evidence of intervening devotion should be included. This would normally take the form of telephone records or other forms of electronic communication. If the couple have lived separately for a longer period, travel receipts can be used to show that contact has been continual and proportionate.
If a prolonged separation is the result of mobility issues (which would include military duties or other foreign assignments), this would take the form of assignment letters or similar documentation.
When submitting email or instant messenger logs, it is important to bear in mind that intervening devotion means evidence of contact and not an exhaustive transcript of each on-line session.
I think your taking a risk if he doesn't visit you again thou..
